Research On Performance Of Wind Turbine Blade Composite Materials

With the continuous large-scale development of wind turbine,the performance and weight of wind turbine blades have higher r equirements.High performance and low quality of carbon fiber can meet the requirements of modern wind turbine blade development,but the high price of carbon fiber has always restricted the application of carbon fiber in large wind turbines.Glassy carbon hybrid fiber composite is a new composite material reinforced by glass fiber and carbon fiber in some way.The quality of carbon fiber is light,tensile strength and modulus are high,but the elongation is low and the price is expensive,and the elongatio n of glass fiber is high and the price is low,so this new composite material can synthesize the strength and toughness of carbon fiber and glass fiber,avoid high cost of carbon fiber and high quality of glass fiber.In this paper,the pure glass fiber ex periment is mainly used to guide the design of the glass layer hybrid experimental laminate program.Through the glassy carbon hybrid experiment,the effect of ±45° ply ratio,hybrid mode and mixing ratio on the mechanical properties of the glassy carbon h ybrid material is discussed.Comparing with the theoretical calculations of classical laminates;through the finite element modal analysis of laminates of specimens in glassy carbon hybrid experiments,the ±45° ply ratio,hybrid mode,and hybrid ratio are discussed for the modality of glassy carbon hybrid materials.influences.Get the following main conclusions:In the pure glass fiber experiment,the ±45° ply ratio has an important influence on the tensile and torsional properties.When the proportion of ±45° ply exceeds 80%,the torsion angle will be too small.In addition,in the tensile and torsion experiments,laminates laminated at three angles of 0°,90°,and ±45° have better performance than 0° and ±45° mixed,90° and ±45° mixed layers.In the glassy carbon hybrid experiment,the better layering scheme for different mechanical properties is as follows: ±45° stretch ratio for stretching is 0 and 40%,and the mixing ratio is 0.43.Compression with ±45° ply ratio of 20% and mixed ratio of 0.29 showed better interlaminar intermixing performance;±45° ply bend ratio was 20% and 40% for pliability,and miscellaneous ratio was 0.29.Stretching ratio of ± 45 ° ply ratio of 40%,60%,mixed ratio of 0.29 of the intermixing performance is better.Comprehensive basic mechanical properties,the ratio of ±45° ply to 40%,and the mixed ratio of 0.29 were the best among the intermixed layers.On the whole,the blending ratio of 0.43 was worse than the blending ratio of 0.29.This is because the interfacial bonding of hybrid materials with a blend ratio of 0.43 was not as good as the blend ratio of 0.29.Comparing the experimental data with the theoretically calculated values of classical laminates,there are obvious errors,and the reasons for the analysis are the eff ects of hybrid effects and the proportion of ±45° ply.In the finite element modal analysis of glassy carbon hybrid laminates,the following conclusions are drawn: The increase in the proportion of ±45° ply is beneficial to improve the torsional properties;glassy carbon hybrid materials have higher natural frequencies than pure glass materials;The natural frequency of the intermixed material is higher than that of the sandwich hybrid material,and the natural frequency of the material with the higher misf old ratio is higher than that of the material with the low miscellaneous ratio;in order to meet the requirements of the safety of the wind turbine operation,the higher the natural frequency,the smaller the displacement should be selected.Therefore,the lower the ratio of ±45° layup is,the better the glassy hybrid scheme is than the pure glass scheme.The interlayer mixing scheme is better than the sandwich hybrid scheme.The scheme with higher mixing ratio is better than the scheme with lower mixing ra tio.The innovation of this paper is that the experiment has performed tensile,compression,bending,and torsion mechanical properties testing.The performance of the glassy carbon hybrid composite material was comprehensively studied from multiple angles,and the basic mechanical properties of the glassy carbon hybrid fiber material were improved.Comprehensive discussion;In the study of multi-directional glassy carbon hybrid fiber materials,based on the theory of hybrid effects,the effect of ± 45 ° ply ratio was considered;based on the basic mechanical properties of glassy carbon hybrid fiber materials,It performs finite element modal analysis and has a more comprehensive understanding of the properties of glassy carbon hybrid fiber materials.